Bug 75207

Summary:	[bisected] GPU hangs due to conditional sends in Metro: Last Light
Product:	Mesa	Reporter:	Tapani Pälli <lemody>
Component:	Drivers/DRI/i965	Assignee:	Eric Anholt <eric>
Status:	VERIFIED FIXED	QA Contact:	Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity:	critical
Priority:	medium	CC:	eero.t.tamminen, kenneth, mattst88, mengmeng.meng
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	error state information

Description Tapani Pälli 2014-02-19 14:06:11 UTC

Rendering *very slow* with Metro game (or likely also other GL app) with Mesa master, following message seen on console:

[drm:i915_hangcheck_elapsed] *ERROR* stuck on render ring
[drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0x20d86000 ctx 2) at 0x20d87398

bisected to
--- 8< ---
commit d92f593d8776ec157ad0e7fa2ee8c9a17fd744ce
Author: Eric Anholt <eric@anholt.net>
Date:   Thu Feb 13 21:37:50 2014 -0800

    i965/fs: Use conditional sends to do FB writes on HSW+.
    
    This drops the MOVs for header setup, which are totally mis-scheduled.
--- 8< ---

commits before this change work fine.

Comment 1 Tapani Pälli 2014-02-19 14:11:07 UTC

(this on Haswell ULT)

Comment 2 Eero Tamminen 2014-02-19 15:42:09 UTC

Created attachment 94365 [details]
error state information

This is completely reproducible, also e.g. with Trine2.

Both in mine and Tapani's case kernel is default Ubuntu 13.10 one.

Attached is error state snapshot from this:
[ 5296.924257] [drm:i915_hangcheck_elapsed] *ERROR* stuck on render ring
[ 5296.924260] [drm] capturing error event; look for more information in /sys/kernel/debug/dri/0/i915_error_state
[ 5302.910090] [drm:i915_hangcheck_elapsed] *ERROR* stuck on render ring

Comment 3 Eric Anholt 2014-02-28 17:36:54 UTC

Reproduced using trine 2, spent a while trying to make a trace to look at and failed.

Comment 4 Eero Tamminen 2014-03-03 08:33:49 UTC

Reverting the guilty commit from Mesa fixes things also in latest Mesa.

Comment 5 Eric Anholt 2014-03-05 21:39:39 UTC

commit 171ec9585f214c2dff3cfc97acebf5286bb5001d
Author: Eric Anholt <eric@anholt.net>
Date:   Tue Mar 4 15:12:40 2014 -0800

    i965: Fix predicated-send-based discards with MRT.

Comment 6 Tapani Pälli 2014-03-06 08:40:14 UTC

(BTW this was tested also with gt2 and using unigine heaven)

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